Improvement in setting steam-boilers



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I C. T. BOARDMA N, OF PAWTUGKET, 'RHODE 'ISLAN D.

Letters Patent No. 70,790, dated November 12, 1867. I

IMPROVEMENT IN SETTING STEAM-BOILERS.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, C. T. BOARDMAN,of Pawtucket, in the county of Providence, and State of Rhode Island, i

have invented a new and useful Improvement on Steam-Boilers or their Setting, of which the followingis afull, clear, and exact description, reference being bad to the accompanying drawing, forming part of this specification, and in whichi Figure 1 represents a vertical longitudinal section of a steam-boiler having my improvement applied to it. Figure 2 a transverse section of the same, viewed from the rear, and Figure 3 a horizontal section thereof. Similar letters of reference indicate corresponding parts. This my improvement is specially applicable to and here shown in connection with a form or construction of boiler substantially as described in Letters Patent of the United States, granted to me on the 23d day of May, 1865, in which, amongst other features, are two plain cylindrical boilers, situated below the rear portions of the said cylindrical boilers, and connected with them by means of laterally-inclined water-legs, in which connection, or a similar construction of boiler, this improvement more immediately relates to the setting or construction of the pier in-rear of the grate-bridge, for circulation in a different or more advantageous mannerof the gaseous products of combnstion beneath the plain cylindrical boilers, and in a return manner to and through the tubular boiler, by stopping short the elevation of said pier relatively to the former, and combining with the pier horizontal partitions extending to the tubular boiler for a portion of its length.

Referring to the accompanying drawing, A represents the outer walls of the setting, B B the plain cylindrieal boilers, G the fireplace, to which a are the grate-bars, D the ash-pit, andE the bridge in rear of the grate, and through which air may be admitted from the ash-pit to mingle in a chamber, F,.with thegases in rear of said bridge, a secondary upper bridge or dip, 0, serving to direct said gases to eifcct such commingling. G is the tubular boiler, arranged below the plain cylindrical boilers B B, in rear of them, and connected by lateral inclined water-legs b b with the latter. H is the pier, arranged in rear of the grate-bridge E, and at a suitable b distance from the front of the tubular boiler G. This pier, instead of being carried or built up to the boilers B B, as described in Letters Patent, hereinbefore referred to, stops short of the same, so as to leave a clear, straight, or uninterrupted passage, I, for the flame and heated gases below or under the boilersB B and over the boiler G, said pier having extending from it, in the rear, horizontal partitions J J, running for some distance along the outside of the tubular boiler G, and connecting the latter with the side walls of the outer setting. The flame and heated gases, after having thus acted upon the upper and lower boilers, dip or turn round and below the rear ends of the partitions J J, and return in a forward or reverse direction below said partitions, and round the outside of the tubular boiler to a chamber, K, in front of it, and from thence in a rearward direction again through the tubes d of the boiler G to the take-up or chimney, all substantially as represented by arrows in fig. 1. Any number of openings, 0, covered by doors or lids, may be arranged in the sides of the outside setting for cleaning-out purposes.

What is here claimed, and desired to be secured by Letters Patent, is

In combination with the cylindrical boilers B B, tubular boiler G, and walls A, of a setting, the pier H and horizontal partitions J J, arranged substantially as specified.

. r (J. '1. BOARDMAN.

Witnesses A. Ln Cnnnc,

J. W. Occurs. 

